The reason players tend towards using higher scroll speeds is that the higher the scroll speed is, the more spread out notes are. Many people find the visual density of lower scroll speeds much more difficult to read, to the point where they may be completely overwhelmed with the sheer number of objects at speeds much lower than they are used to.
The other benefit of high scroll speeds is that you do not have to predict note timing based on music nearly as much. With low speeds, when a note is close to the receptors at the bottom you need to use the music itself to get a good sense of the timing. With higher speeds, by the time a note is close to the receptor, it's time to hit it and there's less uncertainty about the exact timing needed.
So, we've covered the benefits of high speeds, but that still leaves the question of whether you would benefit or not. That's up to you to figure out. In any rhythm game, you will find players exceptionally good at reading low speeds, and some who are exceptionally good at reading high speeds. Most people fall somewhere in the middle. There's no right or wrong speed to use, so it comes down to finding what works best.
My approach for finding the right speed is to start relatively slow, and slowly increase my speed in a game as I get better at it. At lower difficulties, speed selection generally doesn't prevent me from playing anything, but once I get decent and I begin to play hard songs, I find there's a certain minimum speed I must use based on the density of the notes in the song. Once I know the minimum speed that makes things readable, I try to experiment a bit to find if I should stick with the bare minimum speed, or if going higher still helps. Once going higher stops helping, that's usually where I decide to stay.
Generally for me, there's a certain speed where anything higher than that hurts my ability to play, and I usually stick my scroll speed right at that speed. After a while of playing at that speed I lose the ability to play anything slower, and that becomes the speed I always use.